REQ: loop devices and amps for busking

Hi
I'm trying to find out which battery-operated loop devices and amps exist.
(I mean portable and independent of wall outlet... for busking!)
>From http://www.loopersdelight.com/tools/tools.html I collected:
Line6 DL-4
Boss Gigadelay DD-20
Akai E2 Headrush
Electro-Harmonix 16 Second Digital Delay
Peavey PVDJ
Boomerang Boomerang
So far, I know the DL-4, Gigadelay DD-20 are battery operable but I'm not
sure about the others.
Maybe it could make sense to add this criterion (battery-operable or not)
to
the "Tools of the Trade" pages?
Are there any other battery-operated loop devices?
I'm not mentioning the Boss RC-20 and RC-20XL because they don't allow to
control Feedback: it's always at 100%, right?
In this vein I'd be interested in experiences of other musicians on this
list with battery-based looping, including portable amps...
E.g. Gary Lehmann seems to be experienced in this?
http://www.loopers-delight.com/LDarchive/200404/msg00085.html
Thank you
Bernhard